CN115608159A - Cleaning method and cleaning system for hot film coupling type seawater desalination filter membrane - Google Patents

Cleaning method and cleaning system for hot film coupling type seawater desalination filter membrane Download PDF

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Publication number
CN115608159A
CN115608159A CN202211137133.4A CN202211137133A CN115608159A CN 115608159 A CN115608159 A CN 115608159A CN 202211137133 A CN202211137133 A CN 202211137133A CN 115608159 A CN115608159 A CN 115608159A
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China
Prior art keywords
cleaning
membrane
seawater desalination
coupling type
filter membrane
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Pending
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CN202211137133.4A
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Chinese (zh)
Inventor
徐升
吴礼云
凌晨
汪国川
牛建利
陈恩军
吴刚
陈晓峰
张永宏
张鑫
季淑蕊
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Shougang Jingtang United Iron and Steel Co Ltd
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Shougang Jingtang United Iron and Steel Co Ltd
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Priority to CN202211137133.4A priority Critical patent/CN115608159A/en
Publication of CN115608159A publication Critical patent/CN115608159A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B01D2321/162—Use of acids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B01D2321/164—Use of bases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B01D2321/168—Use of other chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

Abstract

The application relates to a cleaning method and a cleaning system of a hot film coupling type seawater desalination filter membrane, belonging to the technical field of membrane cleaning, wherein the water source of the hot film coupling type seawater desalination filter membrane is strong brine, and the cleaning method comprises the following steps: pickling the hot membrane coupling type seawater desalination filter membrane to be cleaned to obtain a pickled hot membrane coupling type seawater desalination filter membrane; carrying out alkali washing on the hot membrane coupling type seawater desalination filter membrane subjected to acid washing to obtain an alkali-washed hot membrane coupling type seawater desalination filter membrane; cleaning the hot membrane coupling type seawater desalination filter membrane subjected to alkali cleaning with an oxidant to obtain a hot membrane coupling type seawater desalination filter membrane cleaned with the oxidant; and cleaning the hot membrane coupling type seawater desalination filter membrane cleaned by the oxidant by using a reducing agent to obtain the cleaned hot membrane coupling type seawater desalination filter membrane. The cleaning method can effectively solve the problem that the conventional membrane cleaning method has poor cleaning effect on the hot membrane coupling type seawater desalination filter membrane with strong brine as a water source.

Description

Cleaning method and cleaning system for hot membrane coupling type seawater desalination filter membrane
Technical Field
The application relates to the technical field of membrane cleaning, in particular to a cleaning method and a cleaning system for a hot membrane coupling type seawater desalination filter membrane.
Background
The hot membrane coupling type seawater desalination is a new trend for seawater desalination development, wherein hot process strong brine is used as a membrane process seawater source, so that the influence of hot process strong brine discharge on the surrounding environment can be eliminated, and the problem of low water temperature of the membrane process water source and restricting the yield in winter can be solved. However, the strong brine remained after the seawater desalination by the hot method is evaporated is used as an ultrafiltration inlet water source, and besides some conventional pollutants such as bacteria, microorganisms and organic matters, the strong brine also has the characteristics of high temperature, strong corrosivity, high concentrations of calcium ions and magnesium ions and the like.
At present, aiming at a hot membrane coupling type seawater desalination hollow fiber ultrafiltration membrane which adopts hot seawater desalination strong brine as a water source, the water source has the characteristics of high chloride ion, strong corrosivity and high calcium and magnesium ion concentration, and the fouling and blocking substances can not be completely removed by using a conventional cleaning method.
Disclosure of Invention
The application provides a cleaning method and a cleaning system for a hot membrane coupling type seawater desalination filter membrane, which aim to solve the technical problem that the cleaning effect of the existing conventional membrane cleaning method for the hot membrane coupling type seawater desalination filter membrane with strong brine as a water source is poor.
In a first aspect, the present application provides a method for cleaning a thermal membrane coupling type seawater desalination filter membrane, where a water source of the thermal membrane coupling type seawater desalination filter membrane is concentrated brine, and the method includes:
pickling the hot membrane coupling type seawater desalination filter membrane to be cleaned to obtain a hot membrane coupling type seawater desalination filter membrane after pickling;
carrying out alkali washing on the hot membrane coupling type seawater desalination filter membrane subjected to acid washing to obtain an alkali-washed hot membrane coupling type seawater desalination filter membrane;
cleaning the hot membrane coupling type seawater desalination filter membrane subjected to alkali cleaning with an oxidant to obtain a hot membrane coupling type seawater desalination filter membrane cleaned with the oxidant;
and cleaning the hot membrane coupling type seawater desalination filter membrane cleaned by the oxidant by using a reducing agent to obtain the cleaned hot membrane coupling type seawater desalination filter membrane.
Further, in the pickling, the pickling cleaning agent includes hydrochloric acid and citric acid.
Further, in the acid washing, the concentration of the hydrochloric acid is 0.2 to 0.4% by weight, and the concentration of the citric acid is 1 to 3% by weight.
Further, in the alkali washing, the concentration of the alkali washing detergent is 0.05 wt% to 0.15 wt%.
Further, in the oxidizer cleaning, the oxidizing cleaning agent includes sodium hypochlorite and a bactericide.
Further, in the oxidant cleaning, the concentration of the sodium hypochlorite is 1800 PPM-2200 PPM, and the concentration of the bactericide is 800 PPM-1000 PPM.
Further, in the reducing agent washing, the reducing agent washing agent includes at least one of sodium bisulfite and potassium bisulfite.
Further, in the reducing agent cleaning, the concentration of the reducing agent cleaning agent is 0.5 wt% to 0.8 wt%.
In a second aspect, the present application provides a cleaning system for a thermal membrane-coupled seawater desalination filtration membrane, which is used to implement the steps of the cleaning method for a thermal membrane-coupled seawater desalination filtration membrane according to any embodiment of the first aspect, and the cleaning system includes:
the reverse osmosis water production device is used for providing a cleaning water source;
the cleaning agent dispensing device is used for dispensing the cleaning agent; one end of the cleaning agent dispensing device is connected with the reverse osmosis water production device; the other end of the cleaning agent dispensing device is sequentially connected with a cleaning water pump, a cleaning filter and a hot film coupling type seawater desalination filter membrane system;
the emptying system is used for emptying liquid of the hot film coupling type seawater desalination filter membrane system before cleaning and emptying liquid medicine of the hot film coupling type seawater desalination filter membrane system and the cleaning agent dispensing device after cleaning; the emptying system is respectively connected with the hot film coupling type seawater desalination filter membrane system and the cleaning agent dispensing device.
Further, the cleaning system further comprises:
the compressed air supply system is used for scrubbing air in the evacuated hot film coupling type seawater desalination filter membrane system after cleaning; and the compressed air supply system is connected with the hot film coupling type seawater desalination filter membrane system.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the embodiment of the application provides a cleaning method of a hot membrane coupling type seawater desalination filter membrane, which comprises acid washing, alkali washing, oxidant washing and reducing agent washing, and can effectively solve the problem of poor cleaning effect of the existing conventional membrane cleaning method on the hot membrane coupling type seawater desalination filter membrane with strong brine as a water source by an efficient cleaning method of 'acid-alkali base washing + oxidation-reduction enhanced washing'. Specifically, the method comprises the following steps: the acid base washing mainly aims at the conventional inorganic scales, metal oxides or hydroxides and the like; the basic alkali washing mainly aims at removing natural organic pollutants, inorganic/organic colloid mixed pollutants, microorganisms and the like; the oxidant cleaning mainly aims at microbial and fungus pollution and the like. The cleaning by the reducing agent mainly aims at rust pollution, metal oxides and hydroxides, aerobic bacteria and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for cleaning a heat membrane coupling type seawater desalination filter membrane according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a cleaning system for a thermal membrane coupling type seawater desalination filter membrane according to an embodiment of the present application;
in fig. 2, (1) is a reverse osmosis water production device; (2) a cleaning agent dispensing device; (3) for cleaning the water pump; (4) for cleaning the filter; (5) a hot film coupling type seawater desalination filter membrane system; (6) a compressed air supply system; (7) to evacuate the system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or can be prepared by an existing method.
The hot membrane coupling type seawater desalination is a new trend of seawater desalination development, wherein hot process strong brine is used as a membrane process seawater source, so that the influence of hot process strong brine discharge on the surrounding environment can be eliminated, the problem of low water temperature of the membrane process water source and restriction on yield in winter can be solved, and the new trend is provided. However, the strong brine remaining after the evaporation of the hot seawater desalination is used as an ultrafiltration inlet water source, and has the characteristics of high temperature, strong corrosivity, high calcium and magnesium ion concentration and the like besides some conventional pollutants such as bacteria, microorganisms and organic matters.
At present, aiming at the hot membrane coupling type seawater desalination hollow fiber ultrafiltration membrane which adopts hot seawater desalination strong brine as a water source, the water source has the characteristics of high chloride ion, strong corrosivity and high calcium and magnesium ion concentration, and the fouling and blocking substances can not be completely removed by using a conventional cleaning method.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
in a first aspect, the present application provides a method for cleaning a thermal membrane coupling type seawater desalination filter membrane, wherein a water source of the thermal membrane coupling type seawater desalination filter membrane is concentrated brine, as shown in fig. 1, the method for cleaning includes:
pickling the hot membrane coupling type seawater desalination filter membrane to be cleaned to obtain a pickled hot membrane coupling type seawater desalination filter membrane;
carrying out alkali washing on the hot membrane coupling type seawater desalination filter membrane subjected to acid washing to obtain an alkali-washed hot membrane coupling type seawater desalination filter membrane;
cleaning the hot membrane coupling type seawater desalination filter membrane subjected to alkali cleaning with an oxidant to obtain a hot membrane coupling type seawater desalination filter membrane cleaned with the oxidant;
and cleaning the hot membrane coupling type seawater desalination filter membrane cleaned by the oxidant by using a reducing agent to obtain the cleaned hot membrane coupling type seawater desalination filter membrane.
The embodiment of the application provides a cleaning method of a hot membrane coupling type seawater desalination filter membrane, which comprises acid washing, alkali washing, oxidant washing and reducing agent washing, and can effectively solve the problem of poor cleaning effect of the existing conventional membrane cleaning method on the hot membrane coupling type seawater desalination filter membrane with strong brine as a water source by an efficient cleaning method of 'acid-alkali base washing + oxidation-reduction enhanced washing'. Specifically, the method comprises the following steps: the acid base washing mainly aims at the conventional inorganic scales, metal oxides or hydroxides and the like; the basic alkali washing mainly aims at removing natural organic pollutants, inorganic/organic colloid mixed pollutants and microorganisms; the oxidant cleaning mainly aims at microbial and fungus pollution and the like. The cleaning by the reducing agent mainly aims at rust pollution, metal oxides and hydroxides, aerobic bacteria and the like.
As an implementation of the examples herein, the pickling cleaning agent includes hydrochloric acid and citric acid in the pickling.
In the application, hydrochloric acid and citric acid are used as pickling cleaning agents in pickling, and the cleaning and the removal are mainly performed on conventional inorganic scales, metal oxides or hydroxides and the like in the hot membrane coupling type seawater desalination filter membrane.
As an embodiment of the examples of the present application, in the acid washing, the concentration of the hydrochloric acid is 0.2 to 0.4 wt%, and the concentration of the citric acid is 1 to 3 wt%.
In some embodiments, the hydrochloric acid may be at a concentration of 0.2 wt%, 0.3 wt%, 0.4 wt%, etc., and the citric acid may be at a concentration of 1 wt%, 2 wt%, 3 wt%, etc., in the acid washing.
As an embodiment of the examples of the present application, in the alkali cleaning, the concentration of the alkali cleaning agent is 0.05 wt% to 0.15 wt%.
In the application, the alkali washing mainly removes natural organic pollutants, inorganic/organic colloid mixed pollutants and microorganisms in the hot film coupling type seawater desalination filter membrane to a certain extent. In some embodiments, the alkaline cleaning agent may be sodium hydroxide, potassium hydroxide, etc., and the concentration of the alkaline cleaning agent may be 0.05 wt.%, 0.06 wt.%, 0.07 wt.%, 0.08 wt.%, 0.09 wt.%, 0.10 wt.%, 0.11 wt.%, 0.12 wt.%, 0.13 wt.%, 0.14 wt.%, 0.15 wt.%, etc.
As an implementation of the embodiment of the present application, in the oxidizing agent cleaning, the oxidizing cleaning agent includes sodium hypochlorite and a bactericide.
In the application, the oxidant is mainly used for cleaning microorganisms, fungus pollution and the like in the hot film coupling type seawater desalination filter membrane. In some embodiments, the sterilant may be selected from commercially available non-oxidizing sterilants.
As an implementation manner of the embodiment of the present application, in the oxidant cleaning, the concentration of the sodium hypochlorite is 1800PPM to 2200PPM, and the concentration of the bactericide is 800PPM to 1000PPM.
In some embodiments, the concentration of sodium hypochlorite in the oxidizer wash may be 1800PPM, 1900PPM, 2000PPM, 2100PPM, 2200PPM, etc., and the concentration of the biocide may be 800PPM, 900PPM, 1000PPM, etc.
As an implementation of the embodiments herein, in the reducing agent rinse, the reducing agent rinse includes at least one of sodium bisulfite and potassium bisulfite.
In the application, the reducing agent is mainly used for cleaning rust pollution, metal oxides and hydroxides, aerobic bacteria and the like in the hot film coupling type seawater desalination filter membrane.
In one embodiment of the examples of the present application, a concentration of the reducing agent cleaning agent is 0.5 wt% to 0.8 wt%.
In the reducing agent cleaning, the concentration of the reducing agent cleaning agent may be 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, or the like.
In a second aspect, the present application provides a cleaning system for a thermal membrane-coupled seawater desalination filtration membrane, which is used to implement the steps of the cleaning method for a thermal membrane-coupled seawater desalination filtration membrane according to any embodiment of the first aspect, as shown in fig. 2, and the cleaning system includes:
the reverse osmosis water production device is used for providing a cleaning water source;
the cleaning agent dispensing device is used for dispensing the cleaning agent; one end of the cleaning agent dispensing device is connected with the reverse osmosis water production device; the other end of the cleaning agent dispensing device is sequentially connected with a cleaning water pump, a cleaning filter and a hot film coupling type seawater desalination filter membrane system;
the emptying system is used for emptying liquid of the hot film coupling type seawater desalination filter membrane system before cleaning and emptying liquid medicine of the hot film coupling type seawater desalination filter membrane system and the cleaning agent dispensing device after cleaning; the emptying system is respectively connected with the hot film coupling type seawater desalination filter membrane system and the cleaning agent dispensing device.
In some embodiments, the reverse osmosis water production device is specifically a hot film coupling seawater desalination reverse osmosis fresh water, and the fresh water is sent to a cleaning water tank to provide a water source for cleaning.
In this application, in some embodiments, the emptying system is to discharge the cleaning waste liquid to the neutralization pond through the discharge valve, and send the cleaning waste liquid to sewage treatment for retreatment, recycle after neutralization treatment.
In this application, the cleaning system of the thermal membrane coupling type seawater desalination filter membrane is realized based on the cleaning method of the thermal membrane coupling type seawater desalination filter membrane, and the specific steps of the cleaning method of the thermal membrane coupling type seawater desalination filter membrane can refer to the above embodiment.
As an implementation manner of the embodiment of the present application, the cleaning system further includes:
the compressed air supply system is used for scrubbing air of the evacuated hot film coupling type seawater desalination filter membrane system after cleaning; the compressed air supply system is connected with the hot film coupling type seawater desalination filter membrane system.
In the application, the technical scheme of air scrubbing by using compressed air after cleaning and soaking and before cleaning and circulating is realized, and a physical cleaning method and a chemical cleaning method are ingeniously combined together.
In summary, the embodiment of the application provides a method and a system for cleaning a hot membrane coupling type seawater desalination hollow fiber ultrafiltration membrane, which solves the technical problem that the hollow fiber ultrafiltration membrane is not completely cleaned by using a conventional cleaning method after being blocked. The invention not only solves the problem of incomplete cleaning, but also prolongs the cleaning period of the hollow fiber ultrafiltration membrane by three times.
The present application is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application. The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer.
Example 1
The embodiment provides a cleaning method of a thermal membrane coupling type seawater desalination filter membrane, wherein a water source of the thermal membrane coupling type seawater desalination filter membrane is strong brine, and the cleaning method comprises the following steps:
pickling the hot membrane coupling type seawater desalination filter membrane to be cleaned to obtain a hot membrane coupling type seawater desalination filter membrane after pickling; in the acid washing, the concentration of the hydrochloric acid is 0.3 wt%, and the concentration of the citric acid is 2 wt%;
carrying out alkali washing on the hot membrane coupling type seawater desalination filter membrane subjected to acid washing to obtain an alkali-washed hot membrane coupling type seawater desalination filter membrane; in the alkaline cleaning, the concentration of alkaline cleaning agent sodium hydroxide is 0.10 wt%;
cleaning the hot membrane coupling type seawater desalination filter membrane subjected to alkali cleaning with an oxidant to obtain a hot membrane coupling type seawater desalination filter membrane cleaned with the oxidant; in the oxidant cleaning, the concentration of the sodium hypochlorite is 2000PPM, and the concentration of the non-oxidizing bactericide is 900PPM;
cleaning the hot membrane coupling type seawater desalination filter membrane cleaned by the oxidant by using a reducing agent to obtain a cleaned hot membrane coupling type seawater desalination filter membrane; in the reducing agent washing, the concentration of the reducing agent washing agent sodium hydrogen sulfite is 0.6 wt%.
The cleaning method of the thermal membrane coupling type seawater desalination filter membrane is implemented by adopting the cleaning system of the thermal membrane coupling type seawater desalination filter membrane shown in figure 2, wherein in figure 2: (1) a reverse osmosis water production device (referred to as reverse osmosis water production for short); (2) a cleaning agent dispensing device (also called a cleaning water tank); (3) for cleaning the water pump; (4) for cleaning filters (filters for short); (5) a hot membrane coupling type seawater desalination filter membrane system (referred to as a hollow fiber ultrafiltration system for short); (6) a compressed air supply system (compressed air for short); (7) is an evacuation system (referred to simply as evacuation). The basic principle is as follows:
the reverse osmosis water production is used for cleaning, (1) a water source is provided for dispensing in the cleaning water tank (2), after the liquid medicine is dissolved and prepared, the liquid medicine is delivered to the hollow fiber ultrafiltration system (5) through the cleaning water pump (3) and the cleaning filter (4), then the cleaning liquid returns to the cleaning water tank (2) to be sequentially and circularly cleaned, and before the next circulation, the compressed air system (6) is used for scrubbing. In addition, before cleaning, the water in the hollow fiber ultrafiltration system (5) is replaced by cleaning liquid medicine through the evacuation system (7); and (3) after cleaning, emptying the liquid medicine in the hollow fiber ultrafiltration system (5) and the liquid medicine in the cleaning water tank (2) through an emptying system (7).
The specific process of cleaning the heat membrane coupling type seawater desalination filter membrane by adopting the cleaning system of the heat membrane coupling type seawater desalination filter membrane shown in figure 2 comprises the following steps:
1) Before the machine (1) is stopped, online backwashing is firstly carried out for 1 time, and fluffy substances on the surface of the membrane are removed. The online backwashing comprises hydraulic cleaning provided by the (3), gas cleaning provided by the (6), and gas-water mixed cleaning provided by the (3) and the (6).
2) After the online backwashing is finished, the step (7) is opened, the concentrated brine in the step (1) is discharged completely, and the chemicals and the concentrated brine ions are prevented from reacting on the basis of discharging anhydrous outflow from the bottom.
3) And (3) supplementing water to the step (2), and repeatedly flushing the ultrafiltration membrane, the pipeline and the like by the aid of the step (3) until the water supplement is the same as the water quality of the drained water. And replacing the ultrafiltration membrane and the strong brine of the pipeline, and washing out residual liquid possibly left in the pipeline after the previous cleaning.
4) And (2) preparing an acid solution by using the hot method strong brine water temperature advantage according to the step (1), performing low-flow pipeline replacement and in-membrane water solution replacement on the hollow fiber ultrafiltration membrane, closing the step (7) after replacement is completed, performing cleaning circulation on the hollow fiber ultrafiltration membrane for 1 hour, then soaking for half an hour, performing air wiping for 1 time before circulation after each soaking, and repeating the steps in the same way.
5) After the acid cleaning is finished, the pipeline and the membrane are washed and the (7) is opened until the water replenishing quality and the water discharging quality are the same.
6) By means of the advantage of hot method concentrated brine water temperature, the alkali solution (alkali contains sodium hydroxide) is prepared by using the step (1), the hollow fiber ultrafiltration membrane is subjected to low-flow pipeline replacement and water solution in the membrane, after replacement is completed, the step (7) is closed, the hollow fiber ultrafiltration membrane is subjected to cleaning cycle for 1 hour, then is soaked for 1 hour, and is subjected to air wiping for 1 time before cycle after each soaking, and the process is repeated.
7) After the alkaline cleaning is finished, the pipeline and the membrane are washed and the (7) is opened until the water replenishing quality and the water discharging quality are the same.
8) And (2) preparing a sodium bisulfite solution by using the (1) with the help of the water temperature advantage of hot method concentrated brine, performing low-flow pipeline replacement and intra-membrane water solution replacement on the hollow fiber ultrafiltration membrane, closing the (7) after replacement, performing cleaning cycle on the hollow fiber ultrafiltration membrane for 1 hour, then soaking for 1 hour, performing air wiping for 1 time before circulation after each soaking, and repeating the steps by analogy.
9) After the sodium bisulfite washing is finished, the pipeline and the film are washed and the (7) is opened until the water replenishing quality is the same as the water discharging quality.
10 Considering the comprehensiveness of ultrafiltration membrane plugs, when oxidant cleaning is carried out, with the help of the advantage of hot method strong brine water temperature, the (1) is used, sodium hypochlorite solution is firstly prepared, then alkali liquor is added into the sodium hypochlorite solution to enable the pH value of the sodium hypochlorite solution to be between 11 and 12, low-flow replacement of a pipeline and an intra-membrane water solution is carried out on the hollow fiber ultrafiltration membrane, after replacement is completed, the (7) is closed, cleaning circulation is carried out on the hollow fiber ultrafiltration membrane for 1 hour, then soaking is carried out for 1 hour, air wiping is carried out for 1 time before circulation after each soaking, and the like, and repeated.
11 After the oxidant washing is finished, the pipeline and the membrane are washed and the (7) is opened until the water replenishing quality and the water discharging quality are the same.
12 In the step 4), preparing water supplement of an acid solution to provide for the step (1), wherein the temperature is preferably 30 ℃, the pH of the acid solution is 2-4, the cleaning time is 4-12 hours, and if the pH rises by 0.5 unit or the color of the liquid medicine changes during cleaning, the circulation needs to be stopped immediately, and the medicine is dispensed again. Cleaning flow 2m per ultrafiltration membrane 3 /h-4m 3 The gas scrubbing pressure is 0.1mpa, and the gas scrubbing time is 45-60S.
13 In the step 6), preparing water supplement of an alkali solution to provide for the step (1), wherein the temperature is preferably 30 ℃, the PH of the alkali solution is 11-12, the cleaning time is 4-8 hours, and if the PH is reduced by 0.5 unit or the color of the liquid medicine is changed during cleaning, the circulation needs to be stopped immediately, and the medicine is dispensed again. Cleaning flow 2m per ultrafiltration membrane 3 /h-4m 3 The gas scrubbing pressure is 0.1mpa, and the gas scrubbing time is 45-60S.
14 In the step 8), the water supplement for preparing the sulfurous acid solution is provided for the step (1), the temperature is preferably 30 ℃, the concentration is 0.5%, and the cleaning time is 4-8 hours. Cleaning flow 2m per ultrafiltration membrane 3 /h-4m 3 The gas scrubbing pressure is 0.1mpa, and the gas scrubbing time is 45-60S.
When the cleaning is carried out using a non-oxidizing bactericide, the cleaning is carried out after the acid cleaning and before the alkali cleaning.
The membrane flux recovery rate of the hot membrane coupling type seawater desalination filter membrane cleaned by the method is 99.9%, and the cleaning period is 3 months.
Example 2
On the basis of embodiment 1, the present embodiment provides a cleaning method and a cleaning system for a thermal membrane coupling type seawater desalination filter membrane, which are different from embodiment 1 only in that: the concentration of the alkaline cleaning agent is 0.05 weight percent; the concentration of sodium hypochlorite is 1800PPM; the concentration of the reducing agent cleaning agent is 0.5 wt%; the rest steps and parameters are the same.
The membrane flux recovery rate of the hot membrane coupling type seawater desalination filter membrane cleaned by the method is 99.3%, and the cleaning period is 2.5 months.
Example 3
On the basis of embodiment 1, the present example provides a cleaning method and a cleaning system for a heat membrane coupling type seawater desalination filter membrane, which are different from embodiment 1 only in that: the concentration of the alkaline cleaning agent is 0.05 weight percent; the concentration of sodium hypochlorite is 2200PPM; the concentration of the reducing agent cleaning agent is 0.6 wt%; the rest steps and parameters are the same.
The membrane flux recovery rate of the hot membrane coupling type seawater desalination filter membrane cleaned by the method is 99.5%, and the cleaning period is 3 months.
Comparative example 1
On the basis of embodiment 1, the present embodiment provides a cleaning method and a cleaning system for a thermal membrane coupling type seawater desalination filter membrane, which are different from embodiment 1 only in that: the hot film coupling type seawater desalination filter membrane is not subjected to acid washing before being subjected to alkali washing, and other steps and parameters are the same.
The membrane flux recovery rate of the hot membrane coupling type seawater desalination filter membrane cleaned by the method is 99.8%, and the cleaning period is 3 months.
Comparative example 2
On the basis of embodiment 1, the present embodiment provides a cleaning method and a cleaning system for a thermal membrane coupling type seawater desalination filter membrane, which are different from embodiment 1 only in that: and after acid washing, the hot film coupling type seawater desalination filter membrane is subjected to subsequent oxidant cleaning and reducing agent cleaning without alkali cleaning, and the rest steps and parameters are the same.
The membrane flux recovery rate of the hot membrane coupling type seawater desalination filter membrane cleaned by the method is 99.5%, and the cleaning period is 2.5 months.
Comparative example 3
On the basis of embodiment 1, the present embodiment provides a cleaning method and a cleaning system for a thermal membrane coupling type seawater desalination filter membrane, which are different from embodiment 1 only in that: and after the hot film coupling type seawater desalination filter membrane is subjected to alkali washing, subsequent reducing agent washing is carried out without oxidant washing, and other steps and parameters are the same.
The membrane flux recovery rate of the hot membrane coupling type seawater desalination filter membrane cleaned by the method is 99.4%, and the cleaning period is 2 months.
Comparative example 4
On the basis of embodiment 1, the present embodiment provides a cleaning method and a cleaning system for a thermal membrane coupling type seawater desalination filter membrane, which are different from embodiment 1 only in that: and the hot film coupling type seawater desalination filter membrane is not cleaned by a reducing agent after being cleaned by an oxidizing agent, and other steps and parameters are the same.
The membrane flux recovery rate of the hot membrane coupling type seawater desalination filter membrane cleaned by the method is 85%, and the cleaning period is 1 month.
Various embodiments of the present application may exist in a range of forms; it is to be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the application; accordingly, the described range descriptions should be considered to have specifically disclosed all the possible sub-ranges as well as individual numerical values within that range. For example, it is contemplated that the description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the stated range, such as 1, 2, 3, 4, 5, and 6, as applicable regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any number (fractional or integer) recited within the range so indicated.
In this application, where the context requires no explicit explanation, the use of directional words such as "upper" and "lower" in particular refers to the direction of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "includes" and the like mean "including but not limited to". In this document, relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. As used herein, "at least one" means one or more, "a plurality" means two or more. "at least one," "at least one of the following," or similar expressions, refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (one) of a, b, or c," or "at least one (one) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.
The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A cleaning method of a hot film coupling type seawater desalination filter membrane is characterized in that a water source of the hot film coupling type seawater desalination filter membrane is strong brine, and the cleaning method comprises the following steps:
pickling the hot membrane coupling type seawater desalination filter membrane to be cleaned to obtain a pickled hot membrane coupling type seawater desalination filter membrane;
carrying out alkali washing on the hot membrane coupling type seawater desalination filter membrane subjected to acid washing to obtain an alkali-washed hot membrane coupling type seawater desalination filter membrane;
cleaning the hot membrane coupling type seawater desalination filter membrane subjected to alkali cleaning with an oxidant to obtain a hot membrane coupling type seawater desalination filter membrane cleaned with the oxidant;
and cleaning the hot membrane coupling type seawater desalination filter membrane cleaned by the oxidant by using a reducing agent to obtain the cleaned hot membrane coupling type seawater desalination filter membrane.
2. The method for cleaning a thermal membrane-coupled seawater desalination filter membrane as claimed in claim 1, wherein in the acid washing, the acid washing cleaning agent comprises hydrochloric acid and citric acid.
3. The method according to claim 2, wherein the concentration of hydrochloric acid in the acid washing is 0.2-0.4 wt% and the concentration of citric acid in the acid washing is 1-3 wt%.
4. The method for cleaning a thermal membrane-coupled seawater desalination filter membrane as claimed in claim 1, wherein the concentration of the alkaline cleaning agent in the alkaline cleaning is 0.05 wt% to 0.15 wt%.
5. The method as claimed in claim 1, wherein the oxidizing agent is selected from sodium hypochlorite and bactericide.
6. The method for cleaning a thermal membrane-coupled seawater desalination filter membrane as claimed in claim 5, wherein in the oxidant cleaning, the concentration of the sodium hypochlorite is 1800PPM to 2200PPM, and the concentration of the bactericide is 800PPM to 1000PPM.
7. The method for cleaning a thermal membrane-coupled seawater desalination filter membrane according to claim 1, wherein in the reducing agent cleaning, the reducing agent cleaning agent comprises at least one of sodium bisulfite and potassium bisulfite.
8. The method for cleaning a thermal membrane-coupled seawater desalination filter membrane according to claim 7, wherein the concentration of the reducing agent cleaning agent in the reducing agent cleaning is 0.5 wt% to 0.8 wt%.
9. A system for cleaning a heat membrane-coupled desalination filtration membrane, for implementing the method for cleaning a heat membrane-coupled desalination filtration membrane of any one of claims 1 to 8, wherein the cleaning system comprises:
the reverse osmosis water production device is used for providing a cleaning water source;
the cleaning agent dispensing device is used for dispensing the cleaning agent; one end of the cleaning agent dispensing device is connected with the reverse osmosis water production device; the other end of the cleaning agent dispensing device is sequentially connected with a cleaning water pump, a cleaning filter and a hot film coupling type seawater desalination filter membrane system;
the emptying system is used for emptying liquid of the hot film coupling type seawater desalination filter membrane system before cleaning and emptying liquid medicine of the hot film coupling type seawater desalination filter membrane system and the cleaning agent dispensing device after cleaning; the emptying system is respectively connected with the hot film coupling type seawater desalination filter membrane system and the cleaning agent dispensing device.
10. The system for cleaning a thermal membrane-coupled desalination filter membrane of claim 9, further comprising:
the compressed air supply system is used for scrubbing air of the evacuated hot film coupling type seawater desalination filter membrane system after cleaning; the compressed air supply system is connected with the hot film coupling type seawater desalination filter membrane system.
CN202211137133.4A 2022-09-19 2022-09-19 Cleaning method and cleaning system for hot film coupling type seawater desalination filter membrane Pending CN115608159A (en)

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CN202211137133.4A CN115608159A (en) 2022-09-19 2022-09-19 Cleaning method and cleaning system for hot film coupling type seawater desalination filter membrane

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CN202211137133.4A CN115608159A (en) 2022-09-19 2022-09-19 Cleaning method and cleaning system for hot film coupling type seawater desalination filter membrane

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